n = int(input()) a = list(map(int,input().split())) a.sort() cnt=0 for i in range(n): if i%2==0:cnt+=a[i] else:cnt-=a[i] print(cnt)
n = int(input()) a = list(map(int,input().split())) a.sort() cnt=0 for i in range(n): if i%2==0:cnt+=a[i] else:cnt-=a[i] print(cnt)
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